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WO2018189029A1 - Procédé d'inhibition de drainage rocheux acide - Google Patents

Procédé d'inhibition de drainage rocheux acide Download PDF

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Publication number
WO2018189029A1
WO2018189029A1 PCT/EP2018/058740 EP2018058740W WO2018189029A1 WO 2018189029 A1 WO2018189029 A1 WO 2018189029A1 EP 2018058740 W EP2018058740 W EP 2018058740W WO 2018189029 A1 WO2018189029 A1 WO 2018189029A1
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WIPO (PCT)
Prior art keywords
sulfur
composition
substrate
group
containing ore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/058740
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English (en)
Inventor
Adrian Mauricio VILLANUEVA BERINDOAGUE
Kristina BRANDT
Guenter Scherr
Dunja Hirsemann
Holger Misslitz
Eva Mahler
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BASF SE
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BASF SE
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Filing date
Publication date
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Publication of WO2018189029A1 publication Critical patent/WO2018189029A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/4811—Condensation polymers of aldehydes or ketones
    • C04B41/4819—Urea-formaldehyde condensation products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B1/00—Dumping solid waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present subject matter relates to a method of inhibiting acid rock drainage.
  • the present subject matter specifically relates to a method of inhibiting acid rock drainage by contacting a substrate comprising sulfur-containing ore with at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water and to the use of at least one composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group for inhibiting acid rock drainage.
  • Acid rock drainage is the release of sulfuric acid or acidic water and heavy metals from metal mines and coal mines to the environment.
  • Acid rock drainage is generally produced from reactive sulfidic tailings and waste rock deposition.
  • the release of acid and heavy metals by effluents to the environments presents a major ecological and environmental problem.
  • the acid formation effected by the oxidation of sulfide minerals typically found in waste rocks and tailings is one of the current major problems in mining industries.
  • the acid rock drainage typically has a low pH which can be detrimental to the vegetation and the aquatic life.
  • the mine wastewaters prior to being released into the environment must be treated to meet the government standards for metal and non-metal ions contained in the water.
  • acid rock drainage is controlled by either preventing the generation of acid rock drainage or treating the effluent after it has been produced.
  • Conventional technique to prevent acid rock drainage includes treatment with lime to neutralize the acidity.
  • US 8,586,817 B2 discloses a composition that includes a slurry made from water and solids, the solids containing powders of limestone, clay and magnesium oxide or magnesium hydroxide to control acid rock drainage.
  • US 5,795,620 discloses increasing the pH of the waste rock environment prior to polymer treatment with an addition of neutralizing agent such as lime. But the neutralization with lime needs to be carried out for an extended period and the process is very expensive.
  • Another approach known to control acid rock drainage is to use compounds that inhibit bacteria.
  • US 5, 550,141 discloses use of compounds like thiol-binding reagents that inhibit bacteria involved in the initial phases of oxidation of tailings.
  • Thiol-binding reagents have been shown to block oxidation of thiosulfate to sulfate by bacteria.
  • many of the thiol blocking compounds are relatively toxic or not effective for inhibiting the formation of acid rock drainage.
  • Yet another approach to prevent acid rock drainage that is disclosed in US 2005/232835 A1 involves suppression of the oxidation of sulfide minerals by adding antioxidants to the sulfide mineral in a stockpile or tailings dumpsite. The issue of acid rock drainage is becoming increasingly important because of the stricter environmental regulations in mining countries.
  • a composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water forms an aminoplast resin upon contact with a substrate comprising a sulfur-containing ore so that acid rock drainage is prevented or inhibited.
  • the present subject matter is directed to a method of inhibiting acid rock drainage comprising:
  • composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water;
  • the aminoplast resin that is formed on the sulfur-containing ore acts as an oxygen barrier that prevents oxygen from penetrating into the sulfur-containing ore so that the oxidation of sulfites to sulfuric acid is inhibited or eliminated.
  • the substrate comprising a sulfur-containing ore is selected from the list consisting of waste rock, fine sands, stockpiled material, pyritic mudstone, coarse gravel and tailings.
  • the substrate comprising a sulfur-containing ore is present in the form of a slurry, a rock pile or an exposed rock.
  • the composition comprises at least one acid. In another embodiment, the composition does not contain any acid.
  • the at least one compound containing an amino group or a carbamide group is urea or melamine.
  • the at least one compound containing an aldehyde group is formalde- hyde.
  • the composition has a pH value in the range of ⁇ 7 to ⁇ 10.
  • the at least one aminoplast resin is selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and melamine-containing urea- formaldehyde resins.
  • the at least one urea-formaldehyde resin has an average molecular weight in the range of >700 to ⁇ 500000 g/mol.
  • the sulfur-containing ore is selected from the group consisting of py- rite, pyrrhotite, bornite, arsenopyrite, galena, cinnabar, sphalerite and chalcopyrite.
  • contacting the composition with the substrate comprising a sulfur-containing ore is effected by spraying the composition onto the substrate comprising a sulfur-con- taining ore.
  • contacting the composition with the substrate comprising a sulfur- containing ore is effected by mixing the composition with the substrate comprising a sulfur-containing ore.
  • the present subject matter is directed to a method of inhibiting acid rock drainage comprising:
  • the present subject matter is directed to a method of inhibiting acid rock drainage comprising:
  • Another aspect of the present subject matter is directed to a substrate comprising a sulfur-con- taining ore that is at least partially coated with at least one aminoplast resin.
  • Yet another aspect of the present subject matter is directed to the use of at least one composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water for inhibiting acid rock drainage.
  • inhibiting acid rock drainage means reducing the leaching by at least 60 percent compared to the native condition, and preferably reducing the leaching by at least 85 percent compared to the native condition, wherein native condition described herein means the condition without application of the composition described in the present subject matter.
  • Various embodiments of method of inhibiting acid rock drainage by use of a composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water are described herein.
  • Acid rock drainage is one of the major problems in the mining and mineral processing industry. The effects of acid rock drainage are extremely serious due to the release of toxic heavy metals and acid leachate and effluent to the environment and waters.
  • the present subject matter is directed to an improved method of inhibiting acid rock drainage by contacting a composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water with a substrate containing sulfur-containing ore so that at least one aminoplast resin is formed on at least a part of the sulfur-containing ore.
  • the acid rock drainage occurs from hard rock mining activities, coal mines and the like.
  • the substrate comprising sulfur-containing ore preferably includes hard rock mines, backfilled coal mining waste, backfilled mining waste, waste rock piles, copper mines, gold mines, lead mines, silver mines, coal mines, fine sands, stockpiled material, overburden, pyritic mudstone, coarse gravel and tailings.
  • the substrate comprising sulfur-containing ore is preferably present in the form of a slurry, a rock pile or an exposed rock.
  • bacteria are present on the surface of the substrate and catalyze the oxidation of the sulfur-containing ore of the substrate.
  • the bacteria are also present in the sulfur- containing ore and by penetration of oxygen into the sulfur-containing ore the bacteria convert sulfur compounds to sulfuric acid by oxidation even inside the sulfur-containing ore.
  • the bacteria capable of such oxidation are called sulfur-oxidizing bacteria.
  • the most well- characterized sulfur-oxidizing bacteria belong to the genus Thiobacillus.
  • the specific bacterial strains that are associated with the process of acid mine drainage preferably include the genera Thiobacillus, Thiomonas, Acidiphilum, Leptospirillum, Acidimicrobium, Ferromicrobium,
  • the sulfur compounds in the substrate are preferably organic sulfur compounds, inorganic sulfur compounds or a mixture of organic and inorganic sulfur compounds.
  • the sulfur compounds are preferably water soluble or water insoluble and generally react or interact with metals in waste rock or tailings to form stable metal sulfides or sulfide complexes which are insoluble in water. The leaching of these sulfide complexes from the waste rock and tailings is difficult.
  • the metals in waste rock and tailing vary depending on the source of the origin and preferably include the metals toxic heavy metals and their oxides, toxic metals having an atomic number greater than 1 1 , selected from the list comprising copper, zinc, gold, manganese, aluminium, silver, cadmium, nickel.
  • the organic sulfur compounds preferably include sodium, potassium or calcium salts of the following ions: ethyl xanthate ion, glucose xanthate ion, isopropyl xanthate ion,
  • the inorganic sulfur compounds preferably include sodium trithiocarbonate, potassium trithiocarbonate, calcium trithiocarbonate, sodium sulfide, potassium sulfide or calcium sulfide.
  • the sulfur containing ore preferably includes sulfur compounds of toxic heavy metals generally defined as metals ores wherein the metal is heavier than sodium and attribute to the toxicity of water.
  • the sulfur containing ore is preferably selected from the group consisting of pyrite, marcasite, pyrrhotite, bornite, arsenopyrite, galena, cinnabar, sphalerite and chalcopyrite.
  • the substrate comprising sulfur containing ore preferably is coal containing pyrite.
  • the substrate preferably contains other organic and inorganic sulfur compounds known to one of ordinary skilled in the art.
  • An embodiment of the present subject matter is a method of inhibiting acid rock drainage comprising preparing a composition comprising at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water.
  • the compound containing an amino group or a carbamide group of the composition preferably is urea or melamine.
  • the compound containing an aldehyde group of the composition is preferably selected from the group consisting of formaldehyde, alkyl- or arylaldehydes like propanal, butanal, benzaldehyde, dialdehydes like glyoxal, and glutaraldehyde.
  • the compound containing an aldehyde group of the composition is more preferably formaldehyde.
  • the composition preferably comprises at least one acid. In another preferred embodiment, the composition does not comprise any acid.
  • the pH of the composition is preferably in the range of ⁇ 7 to ⁇ 10.
  • the molar ratio of the aldehyde to amino group or carbamide group in the composition is preferably in the range from > 0.3:1 to ⁇ 1 :1 , more preferably in the range from > 0.3:1 to ⁇ 0.6:1 , even more preferably in the range from > 0.3:1 to ⁇ 0.55:1 , and most preferably in the range from > 0.3:1 to ⁇ 0.5:1 .
  • the method of inhibiting acid rock drainage further comprises contacting the composition with a substrate comprising sulfur- containing ore, so that at least one aminoplast resin is formed on at least a part of the sulfur- containing ore.
  • the aminoplast resin is preferably selected from the group consisting of trimethylol melamine, methylol urea, dimethylol urea, ethylene diamine, benzoguanamine, fully alkylated melamine, and partially alkylated melamine.
  • the aminoplast resin of this kind may be the one as described in, "Ullmanns Enzyklopadie der ischen Chemie, 4th, revised and expanded edition, Verlag Chemie, 1973, pages 403 to 424 Aminoplaste", and "Ullmann's Encyclopedia of Industrial Chemistry, vol. A2, VCH Verlagsgesellschaft, 1985, pages 1 15 to 141 Amino Resins", and in "M. Dunky, P.
  • the aminoplast resin is preferably used in liquid form in a solution.
  • the amount of the aminoplast resin is preferably in the range from > 25% to ⁇ 90% by weight of the total weight of the solution, more preferably in the range from > 50% to ⁇ 70% by weight of the total weight of the solution.
  • the solution preferably is an aqueous solution, but may also be used in solid form or without solvent with high viscosity.
  • the aminoplast resin is preferably selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and melamine-containing urea-formaldehyde resins.
  • the urea-formaldehyde resin is preferably present in the composition in an amount in the range of ⁇ 0.01 wt.% to ⁇ 1 wt.% by weight related to the overall weight of the composition.
  • the urea- formaldehyde resin has an average molecular weight in the range of ⁇ 700 to ⁇ 500000 g/mol.
  • the compositions to prepare a urea-formaldehyde resin is available under the name DP-OMC- 1202 from BASF.
  • Hardeners are preferably used to catalyse condensation of the aminoplast resins.
  • the hardeners are preferably selected from acids or salts of these, or aqueous solutions of the salts.
  • the acids are preferably selected from inorganic acids such as HCI, HBr, HI, H2SO3, H2SO4, phosphoric acid, polyphosphoric acid, nitric acid, sulfonic acids, such as p-toluenesulfonic acid, methanesulfonic acid, trifluoromethanesulfonic acid, nonafluorobutanesulfonic acid, carboxylic acids, more preferably inorganic acids such as H2SO4, phosphoric acid, nitric acid, sulfonic acids such as p-toluenesulfonic acid, methanesulfonic acid, carboxylic acids such as formic acid, acetic acid.
  • the salts are preferably of halides, sulfites, sulfates, hydrogensulfates, carbonates, hydrogen carbonates, nitrites, nitrates, sulfonates, salts of carboxylic acids, for example formates, acetates, propionates, primary, secondary, and tertiary aliphatic amines, alkanolamines, cyclic, aromatic amines, isopropylamine, 2-ethylhexylamine, di(2- ethylhexyl)amine, diethylamine, dipropylamine, dibutylamine, diisopropylamine, tert-butylamine, triethylamine, tripropylamine, triisopropylamine, tributylamine, monoethanolamine, morpholine, piperidine, pyridine, and also ammonia, preferably of protonated primary, secondary, and tertiary aliphatic amines
  • Curing agents are preferably used to accelerate or bring about the polycondensation of the aminoplast resin.
  • Curing agents for aminoplast resin are preferably selected from the group consisting of organic acids, inorganic acids, acidic salts of organic acids, and acidic salts of inorganic acids, and acid-forming salts such as ammonium salts or acidic salts of organic amines or mixtures thereof.
  • One preferred group of curing agents for aminoplast resin are organic or inorganic acids such as nitric acid, sulfuric acid, formic acid, acetic acid, and polymers with acid groups, such as homopolymers or copolymers of acrylic acid or methacrylic acid or maleic acid.
  • the inventively used composition does not contain any acid because the acidity of the sulfur-containing ore itself is sufficient to effect the polycondensation of the aminoplast resin.
  • the composition comprising the at least one compound containing an amino group or a carbamide group, the at least one compound containing an aldehyde group and water contains both compounds in the form of a precondensate.
  • the precondensate is preferably brought into contact with the substrate and crosslinked on the substrate. More preferably the composition comprises a melamine-formaldehyde
  • a particularly preferred embodiment of the present subject matter is a method of inhibiting acid rock drainage comprising preparing a composition comprising urea, formaldehyde and water.
  • the method of inhibiting acid rock drainage further comprises contacting the composition with a substrate comprising sulfur-containing ore, so that at least one aminoplast resin, preferably at least one urea- formaldehyde resin, is formed on at least a part of the sulfur-containing ore.
  • the urea-formaldehyde resin is preferably present in the composition in an amount in the range of ⁇ 0.01 wt.% to ⁇ 1 wt.% by weight related to the overall weight of the composition.
  • the urea- formaldehyde resin has an average molecular weight in the range of ⁇ 700 to ⁇ 500000 g/mol.
  • the compositions to prepare a urea-formaldehyde resin is available under the name DP-OMC- 1202 from BASF.
  • An effective amount of the composition is preferably contacted with the substrate to inhibit oxidation of sulfur-containing ores and thereby prevent the formation of acid rock drainage.
  • the amount of composition in the range of 400 to 40,000 ppm with respect to the substrate is preferably contacted with the substrate to inhibit oxidation of sulfur-containing ores.
  • the contact of the composition with the substrate is preferably effected by spraying the composition onto the substrate comprising sulfur-containing ore.
  • the composition is preferably sprayed on to a substrate like waste rock, fine sands, stockpiled material, pyritic mudstone, coarse gravel and tailings using a spray apparatus.
  • the composition is preferably sprayed in a liquid form by a spray boom having one or more spray heads.
  • An effective amount of the composition is an amount sufficient to interact with all the reactive sites of the metal sulfide compounds.
  • the contact of the composition with the substrate is preferably effected by mixing the composition onto the substrate comprising sulfur-containing ore.
  • the contact of the composition with the substrate is preferably effected by pouring, coating and other methods known in the technical art.
  • the amount of the composition contacted with the substrate may vary depending on the individual circumstances.
  • the amount of the composition contacted with the substrate should be sufficient to prevent acid rock drainage and inhibit the oxidation of metal sulfides.
  • the time of contacting the composition with the substrate comprising a sulfur-containing ore may vary depending on the individual circumstance to effect polycondensation of the at least one compound containing an amino group or a carbamide group and the at least one compound containing an aldehyde group.
  • the time depends on the nature of the substrate that is being treated, the concentration of the components of the composition, the temperature and other parameters.
  • the inventively claimed method is preferably carried out at a temperature in the range of ⁇ 0 ° C to ⁇ 3/ C, more preferably in the range of ⁇ 5 C to ⁇ 25 C.
  • a substrate comprising a sulfur-containing ore that is at least partially coated with at least one aminoplast resin.
  • the substrate comprising sulfur containing ore preferably included hard rock mines, backfilled coal mining waste, backfilled mining waste, waste rock piles, copper mines, gold mines, lead mines, silver mines, coal mines, fine sands, stockpiled material, overburden, pyritic mudstone, coarse gravel and tailings.
  • the substrate comprising sulfur containing ore is preferably present in the form of a slurry, a rock pile or an exposed rock.
  • sulfur containing ore may include sulfur compounds of toxic heavy metals generally defined as metals ores wherein the metal is heavier than sodium and attribute to the toxicity of water.
  • the sulfur containing ore is preferably selected from the group consisting of pyrite, marcasite, pyrrhotite, bornite, arsenopyrite, galena, cinnabar, sphalerite and chalcopyrite.
  • the substrate may contain other organic and inorganic sulfur compounds known to one of ordinary skilled in the art.
  • the substrate comprising the sulfur-containing ore is preferably partially coated with the aminoplast resin in-situ.
  • the substrate is preferably coated with an effective amount of aminoplast resin to reduce or prevent oxidation process and thereby prevent the production of acid solutions enriched with heavy metals.
  • the aminoplast resin is preferably selected from the group consisting of urea-formaldehyde resins, melamine-formaldehyde resins and melamine-containing urea-formaldehyde resins.
  • the urea-formaldehyde resin is preferably present in the composition in an amount in the range of ⁇ 0.01 wt.% to ⁇ 1 wt.% by weight related to the overall weight of the composition.
  • the urea- formaldehyde resin has an average molecular weight in the range of ⁇ 700 to ⁇ 500000 g/mol.
  • the compositions to prepare a urea-formaldehyde resin is available under the name DP-OMC- 1202 from BASF.
  • a further aspect of the present subject matter is a use of at least one compound containing an amino group or a carbamide group, at least one compound containing an aldehyde group and water for inhibiting acid rock drainage.
  • the acid rock drainage results from disposal of sulfide tailings and waste rock deposition during mining and milling of sulfur-containing ores.
  • the at least one compound containing an amino group or a carbamide group of the composition is preferably urea or melamine.
  • the at least one compound containing an aldehyde group of the composition is preferably selected from the group consisting of formaldehyde, alkyl- or arylaldehydes like propanal, butanal, benzaldehyde, dialdehydes like glyoxal, glutaraldehyde or mixtures thereof.
  • the at least one compound containing an aldehyde group of the composition is more preferably formaldehyde.
  • DP-OMC-1202 is an aqueous solution of a urea-formaldehyde condensation product available from BASF SE, the solid content approximately is 71 %, the pH in the range of 8-9.
  • the bacteria of the type Acidithiobacillius ferrooxidans DSM 14882 were purchased from the Leibniz Institute DSMZ (Leibniz-lnstitut DSMZ-Deutsche Sammlung von Mikroorgan- ismen und Zellkulturen GmbH) and first pre-incubated on a nutrient medium and pyrite at
  • the nutrient medium composition consists of 3 g (NH 4 ) 2 S04, 0.1 g KCI, 0.5 g K 2 HP0 4 , 0.5 g MgS0 4 * 7H 2 0, 0.01 g Ca(NOs)2, added up with bidestilled H2O to 1000 ml.
  • the bacteria solutions were stored at room temperature until further use for incubation for leaching tests.
  • the bacteria were incubated a second time: 5 g of the pre-incubated bacteria solution were added to 50 ml of a 0.01 mol% ammonium chloride solution and 1 g pyrite.
  • the initial concentration of Fe 3+ in the leaching solution of Example 1 and 2 was 600 ppm.
  • the concentration of Fe 3+ was about 800 ppm for both Example 1 and 2 after 6 days and about 900 ppm after 16 days.
  • the concentration of Fe 3+ in a reference example using untreated pyrite was 2600 ppm after 16 days.
  • Example 1 and 2 showed that the leaching was strongly supressed, by about 85 % after 16 days.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
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  • Phenolic Resins Or Amino Resins (AREA)

Abstract

La présente invention concerne un procédé d'inhibition de drainage rocheux acide. De façon spécifique, la présente invention concerne un procédé d'inhibition de drainage rocheux acide par mise en contact d'un substrat comprenant un minerai contenant du soufre avec au moins un composé contenant un groupe amino ou un groupe carbamide, au moins un composé contenant un groupe aldéhyde et de l'eau et l'utilisation d'au moins une composition comprenant au moins un composé contenant un groupe amino ou un groupe carbamide, au moins un composé contenant un groupe aldéhyde pour inhiber le drainage rocheux acide.
PCT/EP2018/058740 2017-04-13 2018-04-05 Procédé d'inhibition de drainage rocheux acide Ceased WO2018189029A1 (fr)

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EP17166412 2017-04-13

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN113149245A (zh) * 2021-04-14 2021-07-23 四川大学 基于水动力因素提高酸性矿山废水处理效率的方法

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Publication number Priority date Publication date Assignee Title
US5550141A (en) 1995-08-31 1996-08-27 Natural Resources - Canada Method for inhibiting the formation of acid mine drainage
US5795620A (en) 1995-10-12 1998-08-18 Kennecott Greens Creek Mining Company Retarding the leaching of metal values from waste rock
US20050232835A1 (en) 2003-03-19 2005-10-20 Yoshiyuki Tanaka Anti-oxidation method for sulfide minerals in sulfide ore
US20070000839A1 (en) * 2004-12-23 2007-01-04 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US8586817B2 (en) 2007-03-07 2013-11-19 The Penn State Research Foundation Method to control acid rock drainage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5550141A (en) 1995-08-31 1996-08-27 Natural Resources - Canada Method for inhibiting the formation of acid mine drainage
US5795620A (en) 1995-10-12 1998-08-18 Kennecott Greens Creek Mining Company Retarding the leaching of metal values from waste rock
US20050232835A1 (en) 2003-03-19 2005-10-20 Yoshiyuki Tanaka Anti-oxidation method for sulfide minerals in sulfide ore
US20070000839A1 (en) * 2004-12-23 2007-01-04 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US8586817B2 (en) 2007-03-07 2013-11-19 The Penn State Research Foundation Method to control acid rock drainage

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Title
"Ullmann's Encyclopedia of Industrial Chemistry", vol. A2, 1985, VCH VERLAGSGESELLSCHAFT, article "Amino Resins", pages: 115 - 141
"Ullmanns Enzyklopadie der technischen Chemie, 4th, revised and expanded edition", 1973, VERLAG CHEMIE, pages: 403 - 424
M. DUNKY; P. NIEMZ: "Holzwerkstoffe und Leime", 2002, SPRINGER, pages: 251 - 259

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113149245A (zh) * 2021-04-14 2021-07-23 四川大学 基于水动力因素提高酸性矿山废水处理效率的方法
CN113149245B (zh) * 2021-04-14 2022-04-08 四川大学 基于水动力因素提高酸性矿山废水处理效率的方法

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